Joseph william jones



(N0 Model.)

J. W. JONES. GRAMOPHONE NEEDLE.

' Patented Apr. 19, 1898.

FIG-3.

INVENTOR WITNESSES:

NlTED STATES PATENT OFFICE.

JOSEPH WILLIAM JONES, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR T HIMSELFAND JOSEPH A. VINCENT. OF SAME PLACE.

GRAlVlOPHGNE-N EEDLE.

srncmrcn'rron forming part of Letters Patent No. 602,453, dated April19, 1898.

Application filed February 9, 1897- Berlal No. 622.698. (No model.)

To all whom it may concern.-

Be itknown that I, JOSEPH WILLIAM JONES, a citizen of the UnitedStates,residing at Philadelphia, in the county of Philadelphia and Stateof Pennsylvania, have invented certain new and useful Improvements inGramophone-Needles; and I do declare the following to be a full, clear,and exact description of the invention, such as will enable othersskilled in the art to which it appertains to make and use the same.

My invention relates to improvements in needles for gramophones, theobject being to produce a needle havinga point or end of re- .duced butuniform diameter, so that it will adjust itself as the point wears awayby use to the spiral groove in the disk containing the record withoutchanging the vibration or sound produced by the instrument.

:0 In the accompanying drawings, Figure 1 illustrates a perspective Viewof a gramophone of the usual construction, showing the manner in whichthe stylus or needle is brought into action with the disk containing 2 5the record. Fig. 2 illustrates a detached side elevation,enlarged,of thediaphragm and easing, showing the manner of adjusting thev stylus orneedle to the spring-plate controlling the diaphragm. Fig. 3 is an endview of 0 that portion of the machine shown in Fig. 2. Fig. 4illustrates a side elevation of the stylus or needle commonly employedin gramophones. Fig. 5 represents a side elevation of a stylus or needleembodying my improve- 5 ments, and Fig. 6 is a. similar view showing asomewhat modified form of my invention.

Referring to the letters of reference in the accompanying drawings, Adesignates the driving-pulley, mounted upon a shaft, which is supportedby a bracket A, the shaft and pulley being operated by a crank A 13 is abalance wheel provided with a grooved hub B for the reception of theclastic cord C, and 13 is a friction-wheel which bears upon the underside of the-disk D for the purpose of rotating the same. Thebalance-wheel l3 and friction-wheel B are mounted upon a shaft supportedby the bracket 13". The latter is provided with a set-screw b foradjusting the shaft.

The diaphragm E and its casing E are mounted upon a bar E hinged at apoint e to a bracket E which is pivotally mounted in an upright E, sothat a universal movemeut is given to the said bar.

The horn F is supported at one end from the bracket E by a rest f and atthe opposite end by an elbow F, connected to the diaphragm-casing. Uponthe support D is detachably secured,by'meaus of a screw-cap D, a disk G,preferably formed of rubber, containing the record in the form of anirregular helical groove or channel, which is traversed by the stylus orneedle I as the disk rotates.

The diaphragm E is acted upon by a springarm E through the medium of apin 6, and a plate-spring E bears upon the said arm, the

tension imparted thereto being regulated by a thumb-nut a I vided with abinding-post J, adapted to receive the stylus or needle I, which isfirmly held in the binding-post J by a screw 7'.

I find in practice that after the needle has passed over the recordseveral times the point is worn away, and where an ordinary needle isemployed, such as I have illustrated in Fig. 4, the worn point presentsa greater surface to the spiral groove in the record and thesound=vibrations become low and indistinct, so that in order to producethe proper volume and quality of sound the worn needle must be removedafter several reproductions of the record and a new one substituted,which requires the operator to keepa supply of pointed needlesconstantly on hand.

In carrying out my invention I provide a needle I with a stout shank I,which is essential in preventing the absorption of the delicatevibrations in passing from the point of the needle to the diaphragm, anda point i. having a uniform diameter approximately the width of thespiral groove in the record. The extreme end, which is brought incontact with said groove, is beveled at the required angle, so that asthe needle is worn The end of the arm E is ploaway the same amount ofsurface traverses the record and the sound waves or vibrations. arerendered clear and distinct and the same the needle-point a stillgreater working capacity I provide the shank I with a hub 13', which isfastened to the shank by a screw 1 'Upon said hub are arranged a numberof points i so that as one of thepoints becomes worn a new point may bebrought into action by turning the hub '8' without removing the shank ofthe needle from the-bindingpost.

Having now described my invention, what I claim, and desire to secure byLetters Patent, is-

1. A gramophone-needle having its working end reduced, said end being ofthe same diameter throughout its length, the same being adapted to thegroove of the record.

2. A gramophone-needle having its working end reduced, said end being of,thesame diameter throughout its length and beveled at the point, thesame being adapted to the 20 groove of the record.

3. A gramophone needle comprising a shank having one or more reducedends of the same diameter throughout their length, the same beingadapted to the groove of the 25 record. a

4. A gramophone needle comprising a shank, I, a hub, i", pivotallysecured thereto, provided with a plurality of points, said points beingof the same diameter through- 39 out their length the same being adaptedto the groove of the record.

In testimony whereof I aflix my signature in presence of two witnesses.

' JOSEPH WILLIAM JONES.

Witnesses:

J A. VINCENT, WILLIAM C. .S'ronvnn.

